<template>
  <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '600px'
    },
    barChartData: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      chart: null
    }
  },
  watch: {
    barChartData: {
      handler(newVal, oldVal) {
        if (JSON.stringify(newVal || {}) !== JSON.stringify(oldVal || {})) {
          if (this.chart) {
            this.chart.setOption({
              tooltip: {
                trigger: 'axis',
                axisPointer: { // 坐标轴指示器，坐标轴触发有效
                  type: 'shadow' // 默认为直线，可选为：'line' | 'shadow'
                }
              },
              grid: {
                top: 10,
                left: '2%',
                right: '2%',
                bottom: '3%',
                containLabel: true
              },
              xAxis: [{
                type: 'category',
                data: this.barChartData.xData,
                axisTick: {
                  alignWithLabel: true
                },
                axisLabel: {
                  rotate: 30
                }
              }],
              yAxis: [{
                type: 'value',
                axisTick: {
                  show: false
                }
              }],
              series: this.barChartData.series,
              dataZoom: [
                {
                  type: 'slider',
                  show: true,
                  xAxisIndex: [0],
                  startValue: 0,
                  endValue: 9
                }
              ]
            })
          } else {
            this.initChart()
          }
        }
      }
    }
  },
  mounted() {
    this.initChart()
    this.__resizeHandler = debounce(() => {
      if (this.chart) {
        this.chart.resize()
      }
    }, 100)
    window.addEventListener('resize', this.__resizeHandler)
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    window.removeEventListener('resize', this.__resizeHandler)
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons', false)

      this.chart.setOption({
        tooltip: {
          trigger: 'axis',
          axisPointer: { // 坐标轴指示器，坐标轴触发有效
            type: 'shadow' // 默认为直线，可选为：'line' | 'shadow'
          }
        },
        grid: {
          top: 20,
          left: '2%',
          right: '2%',
          bottom: '5%',
          containLabel: true
        },
        xAxis: [{
          type: 'category',
          data: this.barChartData.xData,
          axisTick: {
            alignWithLabel: true
          },
          axisLabel: {
            rotate: 30
          }
        }],
        yAxis: [{
          type: 'value',
          axisTick: {
            show: false
          }
        }],
        series: this.barChartData.series,
        dataZoom: [
          {
            type: 'slider',
            show: true,
            xAxisIndex: [0],
            startValue: 0,
            endValue: 9
          }
        ]
      })
    }
  }
}
</script>
